Steam and air feeding device for furnaces.



1 G. A. GUSTAFSON.

STEAM AND AIR FEEDING DEVICE FOR FURNACES.

APPLICATION FILED MAR. 7,1911.

Patented June 18, 191 2.

2 SHEETS-8KEET 1.

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G. A. GUSTAFSON. STEAM AND. AIR FEEDING DEVICE FOR FURNACES.

APPLICATION FILED MAR.7,1911. I

LUQQ BQD Patented June 18, 1912.

2 BHEETSSHEET 2.

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GUSTAF A. cvs'rarsou, F cHIoAeo, ILLINOIS.

STEAM AND AIR FEEDING DEVICE FOR FURNACES.

Specification of Letters Patent.

Patented June 18, 1912.

Application filed March 7, '19i1. Serial No. 612,967.

I To all whom it may concern:

Be it known that L'Gnsrar A. GUS'IAF- sow, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Steam and Air Feeding Devices for Furnaces, of which the following is a specification.

This invention relates to devices-for feeding air or steam, or both, to furnaces, and especially to that class thereof known as time limit devices which usually Operate just after newfuel is supplied, and having means for auton'latically shutting off the supply of air or steam after a limited time.

This invention is especially an improve.- ment on the devices of the type referred to, shown in my U. S. Patents 839,134 and 880,656, in which the flow of a fluid from one end to the' other of a rocking vessel controls the time during which the steam and air feeding devices are in operation.

The present invention has certain advantages with respect to ease of operation and control, as well as certain advantages with respect to mechanical construction.

One feature of the invention is that the device can be operated by hand as well as automatically, for the intended purpose.

A further feature is the provision of a devicc for opening the air damper in' the fire door, for a limited time.

The invention is illustrated in the accompanyingdrawings in which- Figure 1 is a front elevation of a furnace provided with the invention. .Fig. 2 is a side elevation. Fig. 3 a detail of a cylinder and piston for opening the air damper in the tire door. Fig.4 is a detail in top .view. of one of the fire doors. Fig. 5 is a vertical section of the controlling valve and the tilting vessel which operates thesame.

Referring specifically to the drawings, 6 indicates a steam supply pipe provided wlth a hand valve 7 and also with t-heautomatic valve 8, the latter being connected to and operated by a tilting vessel 9 which in construction and operation is substantially the same as that shown inmy U. S. Patent 880,656, above referred to. This device acts to close the valve after a certain interval of time, and the operation of such ,de-

vices is well iuiderstood. h-ads from the valve 8 to jet-nozzles l0, uhich discharge into the furnace above the fuel bed, and these nozzles extend through The steam pipe air supply passages 11 leading from an air trunk 12 extendingacross within the front of the furnace, so that the air is drawn in wlth the steam when the device is active, the inlet of air being controlled by a flap valve 13 at the mouth of the trunk 12. The above described parts are old and well known.

V hen a fire door 14 is opened thevessel 8 is tilted by means of a rod 15, which is connected at its upperend tothe crank 16 of the tilting vessel by means of a pin and a slotat 17. The lower end of the rod 15 is threaded for a suitable length to hold a spiral spring 18 between two nuts '19 on the rod. A forked lever 20 projecting from a rock shaft 21 presses on top of the upper nut, or on a washer placed thereon.- The shaft is rocked when the left hand door 14 is opened, by a lug 14 on said door striking an arm 22 projecting from the rock shaft 21.

A spring 23 tends to return the rock shaft"- to position. A slotted lever 24 presses on the lower nut 19 on the rod 15, said lever arm projecting from a rock shaft 24 which has an arm 26 extending downwardly inposition to be struck by the right. hand door 14 when it is swung open. A spring 27 tends to return this rock shaft to original position. Therefore when either door is openedthe =rod 15 will be pulled down and the vessel.

9. will be tilted and the valve 8 will be held open for the predetermined time.

The slotted connection between the arms 20 and 24: and the rod 15 permits said rodto be pulled down by hand whenever desired to open the steam valve without opening the fire doors. This will compress the spring 18 and rock the tilting vessel 9, with the same result as if the device were operated by the doors. Or if the-fireman so desires he can, after the vessel is tilted, hold the valve open for a longer period of time, by holding down on the rod 15, after the tire doors are closed. Also the steam valve can be closed by. hand in a shorter time, if desired, by lifting up on the rod 15, thereby tilting up the vessel 9 in the closing direction. I

For opening the air dampers or flaps 28 in the fire doors, as well for opening the flap valve 13 to the air trunk, I connect a cylinder 29 to the steam pipe (3 by means of a branch 30 opening into the lower end ofv the cylinder under a piston 31 which slides up and down in said cylinder and has a rod 32 which extends through a stuffing box in the top of the cylinder and is provided with across the boiler front and which will have at its oppositeend an arm similar to 36 connected by another chain ,37 to the air valve 28 in. the other fire door. Obviously the number of such connections -may be increased or decreased, according to the number of valves to be operated.

Near the upper end of the cylinder 29 a ipe is connected, leading to the ash pit,

- or the purpose of feeding steam into the ash pit. When the piston 31 reaches the limit of its upward stroke' in consequence of the steam pressure entering through the pipe 30, the pipe 40' will be uncovered, and so steam will flow therefrom into the ash pit until the'piston descends The lift of the piston will open the air valves 13 and 28.

When the controlling valve 8 is opened either by hand or automatically with the fire doors steam will be discharged through the nozzles 10 as above described and will also lift the piston 31, thereby opening the air valves 13 and 28 and also uncovering the pipe 40 and admitting steam to the ash pit. When the valve 8 closes the pressure is relieved and the piston 31 will drop, thereby closing the air valves and cutting off the flow of steam to the ash pit.- A spring is coiled around the piston rod above the piston, to cushion the impact of the piston against the cylinder head andalso to start the same down after the steam is shut off, and thus prevent sticking of the piston in the upper end of the cylinder. y

The device has the known advantages in cidentto giving an increased supply of air and steam to the fire at the time of adding fresh fuel, for the purpose of preventing smoke, and inasmuch as hand operation is possible the same result can be effected whenever conditions makeit advisable.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is 1. In a stean and air feeding device for furnaces, the combination of steam and air pipes, leading to the combustmn chamber of .the furnace, a controlling valve in the steam p1pe, a valve in the alr pipe, a cylinder communicating with the said steam pipe, beyond said controlling valve, whereby said valve controls the steam supply to the combustion chamber and also the steam supply to the cylinder, and a piston in the cylinder .connected to the valve in the air pipe and adapted to open the same when steam pressure is admitted through said controlling valve.

' 2.- In a steam and air feeding device for furnaces, the combination of steam and air pipes leading to the combustion chamber of the furnace, controlling valves in said pipes,

a cylinder communicating with said steam pipe between the valve and the-furnace, a piston in the cylinder, connected to the air valve and adapted to be advanced by admission of steam pressure through said steam valve, and an outlet leading from the cylinder to the ash pit of the furnace, said piston being normally between the inlet to the cylinder and the said outlet pipe and adapted to be advanced beyond said outlet pipe and to admit steam thereto from the cylinder.

3. In a steam feeding device for furnaces,-

the combination of a valve controlling the flow ofsteam to the furnace, a tilting vessel connected to the valve and adapted to delay the closure thereof, an operating rod connected to said tilting vessel, levers located in position to be struck by respective fire doors of the furnace, each lever being loosely connected to the operating rod, and a spring coiled around said rod between said levers.

In testimony whereof, I affix my signature in presence of two witnesses.

GUSTAF A. GUSTAFSON.

Witnesses D. D. DUBEN, B. R. CRAMPTON. 

